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Q. No.In the DNA double helix:
I:
At each step of ascent, the strand turns 34º.
II:
The rise per base pair would be 0.36 nm.
1.
Only I is correct
2.
Only II is correct
3.
Both I and II are correct
4.
Both I and II are incorrect
Subtopic: The DNA |
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Level 3: 35%-60%
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Consider the given two statements:
| I: | In competitive enzyme inhibition, the substrate and inhibitor cannot bind to the enzyme at the same time. |
| II: | The inhibitor always has a much higher affinity for the active site than the normal substrate. |
| 1. | Both I and II are correct and II explains I |
| 2. | Both I and II are correct but II does not explain I |
| 3. | I is correct but II is incorrect |
| 4. | I is incorrect but II is correct |
Subtopic: Enzyme Inhibition |
Level 3: 35%-60%
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The substrate has to go through a higher energy state or transition state during its conversion to a product in:
| I: | Exothermic spontaneous reactions |
| II: | Endothermic reactions |
| III: | Enzyme catalyzed reactions |
2. Only I and III
3. Only II and III
4. I, II, and III
Subtopic: Enzyme Catalysis |
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Level 3: 35%-60%
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Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R):
In the light of the above statements choose the correct answer from the options given below:
| Assertion (A): | Lipids are macromolecules |
| Reason (R): | They have a molecular weight range of ten thousand Daltons and above. |
| 1. | Both (A) and (R) are True and (R) is the correct explanation of (A). |
| 2. | Both (A) and (R) are True but (R) is not the correct explanation of (A). |
| 3. | (A) is True but (R) is False. |
| 4. | Both (A) and (R) are False. |
Subtopic: Element Analysis |
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Level 3: 35%-60%
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| A. | Release of products of the reaction |
| B. | Binding of substrate to the active site of the enzyme |
| C. | Formation of enzyme-substrate complex |
| D. | Alteration in the shape of the enzyme |
| E. | Enzyme free to bind another molecule of substrate |
1. B > C > D > A > E
2. B > D > C > A > E
3. B > D > A > E > C
4. B > E > D > C > A
Subtopic: Enzymes | Enzyme Catalysis |
57%
Level 3: 35%-60%
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Which of the following is wrong with respect to 'biomolecules'?
Choose the correct answer from the options given below:
1. D & E only
2. A & D only
3. A, B & D only
4. B, E & C only
| A. | Cellulose and starch can hold I2 due to formation of helical secondary structures |
| B. | Proteins transport nutrient across cell membrane and fight infectious organisms |
| C. | At high temperature, enzymes get damaged while inorganic catalysts work efficiently |
| D. | In animal tissue, different drugs, pigments, essential oil, magnesium, O2 compounds are noticed |
| E. | DNA and RNA have three chemically distinct components - heterocyclic, monosaccharides and phosphates. |
1. D & E only
2. A & D only
3. A, B & D only
4. B, E & C only
Subtopic: Proteins | Carbohydrates | Enzymes |
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Level 3: 35%-60%
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Primary proteins are also known as polypeptides, because:
1. they are linear chains.
2. they are polymers of peptide monomers.
3. successive amino acids are joined by peptide bonds.
4. they can assume many conformations.
1. they are linear chains.
2. they are polymers of peptide monomers.
3. successive amino acids are joined by peptide bonds.
4. they can assume many conformations.
Subtopic: Proteins |
56%
Level 3: 35%-60%
NEET - 2022
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The enzyme commission number of an enzyme 'X' is 2.3.1.4. 'X' belongs to a class of enzymes that catalyses:
| 1. | NAD+ + 2H+ + 2e- \(\longrightarrow\) NADH + H+ |
| 2. | S - G + S1 \(\longrightarrow\) S + S1 - G |
| 3. | X - C - C - Y \(\longrightarrow\) X - Y + C = C |
| 4. | A - B + H2O \(\longrightarrow\) A - OH + B - H |
Subtopic: Enzymes Classification |
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Level 2: 60%+
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Prosthetic groups are distinguished from other cofactors in that they:
1. Only I is true
2. Only II is correct
3. Both I and II are correct
4. Both I and II are incorrect
| I: | are organic compounds. |
| II: | are tightly bound to the apoenzyme. |
2. Only II is correct
3. Both I and II are correct
4. Both I and II are incorrect
Subtopic: Enzyme Cofactors |
Level 3: 35%-60%
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The number of correct statements from the given statements are:
1. 2
2. 3
3. 4
4. 5
| I: | Almost all enzymes are proteins. |
| II: | Some nucleic acids can behave like enzymes. |
| III: | No enzyme in living organisms can function above 40 °C. |
| IV: | Enzymes are the reason that chemicals react with each other. |
| V: | Enzymes are not sensitive to pH in their environment. |
2. 3
3. 4
4. 5
Subtopic: Enzymes | Enzyme Catalysis | Factors Affecting Enzyme Catalysis Reaction |
Level 3: 35%-60%
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